JPH07143065A - Signal transmission device and electric door mirror - Google Patents

Abstract

PURPOSE:To transmit power and a control signal, which are supplied to an electric unit used for an electric mirror and the like, without contact. CONSTITUTION:A transmission part 11a having a primary coil 14a to which an AC power source 20 is connected and a light guiding member 12a guiding light emitted from a light-emitting means 16a is made to face a reception part 11b having a secondary coil 14b to which a DC circuit 28 is connected and a light-guiding member 12b guiding an optical signal to a light-receiving means 16b through a space S. A microcomputer 23 operates by a switch 24 and a control signal is outputted to the light-emitting means 16a. The light-emitting means 16a emits light by the signal and it is converted into the optical signal. Then, the signal is guided to the light-receiving means 16b by the light-guiding member 12a and the light-guiding member 12b. The light-receiving means 16b outputs the signal to a decoder 26, converts it into the control signal and transmits it to a driving part 30. On the other hand, a magnetic field is generated in the primary coil by the AC power source 20, and guiding voltage is generated in the secondary coil 14b. The guide voltage is made into direct current by a direct current circuit 28, and it is supplied to the driving part 30 and a reception signal conversion circuit 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in an electric door mirror or the like having an electric motor, and more specifically, a signal transmission device for transmitting electric power and control signals supplied to the electric motor in a non-contact manner About the electric door mirror that was.

[0002]

2. Description of the Related Art Conventionally, in an automobile door mirror or the like, a plurality of electric motors (including electronic devices) have been used to impart many functions in order to improve added value. There is also a strong demand for smaller size and lighter weight as well as improved added value. In such a situation, handling a harness for supplying and controlling electric power to a plurality of electric motors poses a problem, and in Japanese Utility Model Laid-Open No. 5-9236, a method of transmitting these signals in the air is disclosed. There is.

[0003]

However, in the method disclosed in the above document, it is necessary to provide a modulation / demodulation circuit in order to simultaneously transmit the electric power and the control signal by the same signal, and the control becomes complicated, and the signal Interference between them,
There was a problem that the separation of each signal was bad. Therefore, the present invention clearly separates the transmission of power and control signals, and
An object of the present invention is to provide a signal transmission device that transmits signals in a manner that does not affect each other and an electric door mirror using the signal transmission device.

[0004]

In order to achieve the above object, a primary coil connected to an AC power source, a transmission signal converter for converting a control signal for controlling an electric motor into an optical signal,
A transmitter having a first light guide member which is disposed in the peripheral portion and the central portion of the primary coil and guides an optical signal emitted by the transmission signal converter, and a magnetic field emitted by the primary coil and electromagnetic interaction. A secondary coil for generating an induced voltage, and a second light guide member disposed in the peripheral portion and the central portion of the secondary coil for receiving the optical signal guided to the first light guide member. A receiving unit including a receiving signal converting unit that receives an optical signal guided to the second light guide member, converts the optical signal into an electric signal, and outputs a control signal to the electric motor. It is characterized in that it is configured to transmit power and control signals from the transmitting unit to the receiving unit in a non-contact manner. Further, the transmission signal conversion unit includes a switch, a microcomputer that outputs the control signal in response to a command from the switch, and a light emitting unit that converts the control signal from the microcomputer into the optical signal. Further, the reception signal conversion unit includes a light receiving unit that converts the optical signal into an electric signal, and a decoder that converts the electric signal into a control signal. In addition, as an electric door mirror using this signal transmission device, a shaft is provided with a pivotal support portion, the transmitting portion and the receiving portion are adjacently inserted, and a frame that rotates around the pivotal support portion. Is inserted, and the frame is rotated by the electric motor.

[0005]

According to the above structure, an AC voltage is applied to the primary coil, and thereby an induced voltage is generated in the secondary coil separated by a predetermined space. Then, this induced voltage is rectified by a DC circuit and supplied as a DC voltage to an electric motor or the like. Further, the control signal is converted into an optical signal by the light emitting means and guided by the first light guide member. Therefore, since the second light guide member faces the first light guide member with a predetermined space therebetween, the optical signal from the first light guide member enters the second light guide member and is guided to the light receiving means. The light receiving unit outputs the optical signal to the decoder as an electric signal, converts the optical signal into a control signal, and outputs the control signal to the electric device. In this way, power and control signals are transmitted by different means such as electromagnetic induction and optical signals, and are transmitted independently. Further, by using such a signal transmission device for an electric door mirror, it is possible to reduce the space for wiring the harness at the rotating portion, downsize the electric door mirror, and prevent malfunctions and improve reliability. .

[0006]

EXAMPLE 1 Example 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a signal transmission device 10 according to the present invention. The signal transmission device 10 includes a transmission unit 11 a and a reception unit 11 b that transmit a control signal and electric power for controlling the driving unit 30 (electric motor) of the electric door mirror in a contactless manner through the space S, and also an electric signal. And a receiving section 1 for generating a control signal which is a signal and converting the control signal into an optical signal and outputting the optical signal to the transmitting section 11a.
A reception signal conversion unit 25 that converts the optical signal received by 1b into an electric signal and outputs a control signal to the drive unit 30, an AC power supply 2
0, the reception signal converter 25 and the drive unit 30 have a DC circuit 28 for supplying electric power.

The transmitter 11a and the receiver 11b are wound around the light guide member 12a (first light guide member), the light guide member 12b (second light guide member), the ferrite cores 13a and 13b, and the bobbin. Primary coil 14a, secondary coil 14b, L
It has a light emitting means attaching portion 15a to which a light emitting means 16a such as an ED is attached and a light receiving means attaching portion 15b to which a light receiving means 16b such as a photodiode is attached. The transmission signal converter 21 converts the electric signal into an optical signal, and starts (and ends) the above-mentioned light emitting means 16a and the signal transmission device 10.
Switch 24 (the number of the switch 24 need not be one and can be increased by the function of the drive unit 30), and the microcomputer 23 that outputs a predetermined electric signal to the light emitting means 16a by this switch 24. .

The signal receiving section 25 receives the optical signal and converts it into an electric signal, and the light receiving means 16b described above, and the decoder 2 which converts the electric signal from the light receiving means 16b into a control signal.
It consists of 6. Further, the DC circuit 28 has a rectifying circuit 28a for rectifying AC and a stabilizing power supply circuit 28b for stabilizing it, and the driving unit 30 rotates the electric door mirror or changes the reflection direction of the mirror 32a. , 32
It has b and the drive circuit 31 which drives these.

In the above structure, power transmission is performed as follows. When an AC voltage is applied to the primary coil 14a by the AC power supply 20, a magnetic field is generated, and an AC voltage is generated in the secondary coil 14b by electromagnetic induction. Secondary coil 1
A DC circuit 28 including a rectifier circuit 28a and a stabilized power supply circuit 28b is connected to 4b, so that the secondary coil 14
The AC voltage generated in b becomes a DC voltage and is supplied to the drive unit 30 and the reception signal conversion unit 25.

The control signal is transmitted as follows. For example, when the driver wants to tilt the electric door mirror to store it, he / she turns on the switch 24 corresponding to the operation and outputs a signal to the microcomputer 23. The microcomputer 23 outputs an electric signal corresponding to the instruction content of the switch 24 to the light emitting means 16a.
The light emitting means 16a converts the electric signal into an optical signal by emitting light based on the electric signal. Light emitting means 1
The optical signal emitted from 6a passes through the inside of the light guide member 12a, is guided via the space S to the light guide member 12b of the receiving portion 11b provided opposite thereto, and is incident on the light receiving means 16b. Light receiving means 1
6b converts the received optical signal into an electric signal and outputs the electric signal to the decoder 26. The decoder converts the electric signal into a control signal and sends the control signal to the drive unit 30. Then, the drive circuit 31 controls and drives the motor 32a and the like based on this control signal. As described above, the power and control signals supplied to the drive unit 30 can be transmitted in a non-contact manner because the transmission unit 11a and the reception unit 11b are arranged side by side through the predetermined space S.

2 to 4 show the signal transmission device 10 described above.
2 is applied to an electric door mirror, and FIG.
a or the light guide members 12a and 12b of the receiver 11b, the ferrite cores 13a and 13b, the primary or secondary coil 14a,
14b is an exploded perspective view showing 14b. FIG. 3 is a partially exploded perspective view of the electric door mirror 100, and FIG. 4 is a sectional view when assembled. In FIG. 2, the light guide member 12a,
A cylindrical ferrite supporting portion 17 having a round hole 17c into which a pivot shaft 51b described later is inserted in the central portion of 12b.
b is provided, and a convex portion 17a is provided in the peripheral portion. Further, a coil support portion 18b having a round hole 18c into which the ferrite support portion 17b is inserted is provided at the center of the ferrite cores 13a and 13b, and a peripheral portion is provided with a concave portion 18a that engages with the convex portion 17a. There is. Further, the primary or secondary coils 14a and 14b are composed of a bobbin 19b and a coil 19a wound around the bobbin 19b, and the bobbin 19c is provided with a round hole 19c into which the coil support portion 18b is inserted. The light guide members 11a and 11b having such a configuration are shown in FIG.
Combine as shown in FIG. 3 and 4,
The shaft 51 has a flange portion 51a and a pivotally supporting portion 51b, and the flange portion 51a is provided with a hemispherical groove 51c into which a ball 52 is fitted and is fixed to the base 50. Then, the transmitting section 11a and the receiving section 1 are connected to this pivotal support section 51b
The 1b frame 53 is sequentially inserted.

A groove (not shown) into which the ball 52 is fitted is provided on the bottom surface of the frame 53 facing the flange 51a to regulate the rotational position of the frame 53 with respect to the base 50. Further, the spring 54, the gear 55a, and the plate clutch 57 are inserted into the pivotal support portion 51b protruding from the frame 53, and the plate 58 is attached to the pivotal support portion 51b.
These are prevented from being separated by engaging with the groove 51d provided at the tip of the. A groove 55b into which the ball 56 is fitted is provided on the upper surface of the gear 55a and is urged by the spring 54 to produce the action of the clutch.

In such a structure, when the driver turns on the switch 24, the control signal is transmitted to the drive unit 30 by the above-described procedure, and the motor 32a or the like rotates. The driving force of the motor 32a or the like is transmitted to the gear 55a via the gear 59, and the frame 53 rotates to be positioned at the storage position or the like. At the time of this rotation, since the transmission unit 11a is fixed to the body 50 and the reception unit 11b is fixed to the frame 53, the transmission unit 11a and the reception unit 11b rotate relative to each other, but there is no mechanical contact ( Since they are arranged side by side through the space S), the power and control signals can be transmitted without affecting the rotation of the frame 53. The light emitting means 16a and the light receiving means 16b are not limited to the above-mentioned ones. Further, it is not necessary to directly attach these to the light guide member, and they may be connected via an optical fiber or the like.

[0014]

[Effect] As described above, since the transmission of electric power and control signal is performed by electromagnetic induction and optical transmission, it is not necessary to wire a harness in a rotating portion, and assembly and disassembly are facilitated. In addition, the reliability of the power and control signals has been improved by eliminating the need for signal interference and signal separation. Further, since the light guide member is arranged so as to cover the ferrite core, it is possible to have the function of protecting the ferrite core.

[Brief description of drawings]

FIG. 1 is a block diagram of a signal transmission device according to the present invention.

FIG. 2 is an exploded perspective view of a transmission unit or a reception unit of an electric door mirror using the signal transmission device of FIG.

FIG. 3 is an exploded perspective view of the electric door mirror of FIG.

4 is a cross-sectional view of FIG.

[Explanation of symbols]

 10 signal transmission device 11a transmitting unit 11b receiving unit 12a light guide member (first light guide member) 12b light guide member (second light guide member) 14a primary coil 14b secondary coil 16a light emitting unit 16b light receiving unit 21 transmission signal Conversion unit 23 Microcomputer 24 Switch 25 Received signal conversion unit 26 Decoder 28 DC circuit 30 Drive unit (electric motor) 51 Shaft 51b Pivot support 53 Frame

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[Procedure amendment]

[Submission date] December 28, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

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Claims (4)

[Claims] 1. A primary coil connected to an AC power source, a transmission signal conversion unit for converting a control signal for controlling an electric motor into an optical signal, and a transmission unit disposed around and around the primary coil. A transmitter having a first light guide member for guiding an optical signal emitted by a signal converter, a secondary coil electromagnetically interacting with a magnetic field emitted by the primary coil to generate an induced voltage, and the secondary coil. A second light guide member which is disposed in the peripheral portion and the central portion of the first light guide member for receiving the optical signal guided to the first light guide member, and receives the optical signal guided to the second light guide member. Then, the reception unit having a reception signal conversion unit that converts the electric signal into an electric signal and outputs a control signal to the electric motor is arranged side by side through a predetermined space, and electric power and power are transmitted from the transmission unit to the reception unit without contact. A signal transmission device characterized by transmitting a control signal. 2. The transmission signal conversion unit includes a switch, a microcomputer that outputs the control signal in response to a command from the switch, and a light emitting unit that converts the control signal from the microcomputer into the optical signal. The signal transmission device according to claim 1, wherein 3. The signal transmission device according to claim 1, wherein the reception signal conversion unit includes a light receiving unit that converts the optical signal into an electric signal, and a decoder that converts the electric signal into a control signal. . 4. The electric motor is provided with a pivotal support portion provided upright on a shaft, the transmitting portion and the receiving portion being adjacently inserted, and a frame rotating around the pivotal support portion being inserted. The electric door mirror using the signal transmission device according to any one of claims 1 to 3, wherein the frame is rotated by the above.